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https://issues.apache.org/jira/browse/ORC-42?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15147020#comment-15147020
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Dinesh S. Atreya commented on ORC-42:
-------------------------------------
{panel:title=MVCC_ORC Counter based}
Sample is given below for illustration.
|| Data ID || Activity || Data Create Counter || Data Expiry Counter ||
Comments ||
| 1 | Insert | 40 | MAX_VAL | Conventionally MAX_VAL is
null.
In order to maintain update size, MAX_VAL is pre-seeded for our purposes. |
| 1 | Delete | 40 | 47 | Marked as delete when current counter
was 47. |
| 2 | Update (old Delete) | 64 | 78 | Mark old data is DELETE |
| 2 | Update (new insert) | 78 | MAX_VAL | Insert new data. |
{panel}
> Advance Hadoop Architecture (AHA) - Advance ORC (Umbrella) JIRA
> ---------------------------------------------------------------
>
> Key: ORC-42
> URL: https://issues.apache.org/jira/browse/ORC-42
> Project: Orc
> Issue Type: New Feature
> Reporter: Dinesh S. Atreya
>
> Link to Umbrella JIRA
> https://issues.apache.org/jira/browse/HADOOP-12620
> See
> https://issues.apache.org/jira/browse/HADOOP-12620?focusedCommentId=15046300&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15046300
> for more details.
> This JIRA is an umbrella (parent/master) JIRA for advancing ORC given
> https://issues.apache.org/jira/browse/HDFS-9607.
> A number of capabilities that can be added to ORC once HDFS update is
> supported may include:
> JSON_ORC -- native processing of JSON (add MongoDB/CouchDB type capabilities
> in Hadoop)
> XML_ORC -- add native XML processing capability to ORC.
> RDF_ORC -- native processing of RDF documents
> MVCC_ORC -- Add Multi Version Concurrency MVCC support to ORC
> INDEX_ORC -- Create a variety of Indexes such as B-Tree, Bitmap etc. to other
> files in Hadoop.
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